The generalized Ulam spiral [La spirale d'Ulam généralisée].




Starting from the center of the picture, the points are numbered (1, 2, 3,...) when following a square spiral. The radius of the N-th sphere is proportional to the number of divisors of N.


[Plus d'informations à propos de la spirale d'Ulam et de ses généralisations -en français/in french-]
[More information about the Ulam spiral and ist generalizations -in english/en anglais-]


(CMAP28 WWW site: this page was created on 02/01/1999 and last updated on 01/26/2024 18:30:34 -CET-)



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